Machine for sharpening knives.



E. DINGER 6; H. TIMMER. MACHINE FOR SHARPEN-ING KNIVES.

APPLICATION FILED MAY 29 1913.

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B. DINGER & H. TIMMER. MACHINE FOR SHARPENING KNIVES. APPLICATION FILED MAY29 191s.

1,101,261. Patented June 23, 1914.

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E. DINGER 6: H. TIMMER.

MACHINE FOR SHARPENING KNIVES. APPLICATION FILED MAY 29, 1913.

1,101,261, Patented June 23, 1914.

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UNITED STATES. PATENT OFFIC ERNST DINGER, OF SOLINGEN, AND HEINRICH TIMMER, OF I-IAAN, GERMANY.

MACHINE FOR SHARPENING KNIVES.

Specification of Letters Eatent.

Patented June 23, 1914.

Application filed May 29, 1913. Serial No. 770,608.

' Haamrespectively, Germany, have invented certain new and useful Improvements in Machines for Sharpening Knives, of which the following is a specification.

This invention relates to a double-acting machine for sharpening table knives and the like, having blades with or without a curved strengthening on their ends.

The improved machine is distinct from those hitherto known in the art by the grinding stones, which are spring-pressed, being gradually advanced and thus adapted to sharpen first the concave surfaces of the strengthening and then the blade itself by drawing the latter along the grinding faces of the grinding stones.

The accompanying drawing shows the im proved machine.

Figure 1 is a front view, Fig. 2 a side view, and Fig. 3a fragmentary plan view, of the same.

The machine frame a, which above carries a water trough, is on two opposite sides provided with projecting tables 5, on which slides d can be moved by means of screwspindles 0. The slides form bearings for axles e, which on their inner ends carry each a grinding stone 9 by means of a faceplate f.

At the outer ends, the slides d carry each an adjusting-screw k, which, by a pin 2' thereon, engages with a boring in the adj acent axle 6. Around the pin "5, a spiral spring j is located, which tends to press the axle continuously inward. This inward movement of the axles e is, however, dependent upon angle-levers 75, which are fulcrumed on the slides d and which bear with their vertical ends against fixed disks m of the axles a, while their horizontal ends are acted upon by double-armed levers Z, which are controlled by cam disks n located on an axle 0.

The blades p (Fig. 3) to be sharpened, are fixed on an appropriate support 9, which is arranged on rods 1" adapted to be moved to and fro in front of the grinding stones. The rods 7" are pivoted to a common lever system 8, which in turn is pivotally connected with a link t, which is fulcrumed on the machine frame a and fitted with a roller a, which is in engagement with a cam disk 71. The latter is located .on an axle w, which transmits its movement to the axle 0 by means of bevel-wheel pairs 00 and a through the medlum of an lncllned spindle. On the axles 6 driving pulleys A, and on the axle w a driving-pulley B, are provided.

As shown 1n Flg. 3, the grinding stones 9 face the strengthening of the blade to be sharpened, with the right hand ends of their grinding faces, this indicating the beginning I of the grinding action. In this position of the grinding stones, the double-armed levers l bear upon the highest point of cam disks n (Fig. 2), at which moment the angle-levers 76 have drawn the axles 0 into their outermost position. Upon axle w being set in ro tation, the cam disk 1) does first not act, while a rotation of the cam disks n is effected and, consequently, the double-armed levers l release the levers 72 from the tensioned position, whereby the springs 7' advance the axles 6 with the grinding stones 9 toward the work-piece. Thereupon, disk 0 begins slowly to act, that is it draws the work-piece slowly along the grinding faces of the grinding stones, the advance of the latter being continued until the concave strengthening of the blade is sharpened, whereupon the blade itself is sharpened. Upon cam disk o having accomplished one turn, the work-piece is drawn with its whole length along the grinding stone. Thereupon, that part of the axle to carrying cam disk 1; is uncoupled from that part of the axle carrying the driving-pulley B, for which purpose a clutch C is interposed between both parts. Said clutch may be disengaged by a pin, which is provided on the disk 4) in such a way that it presses at a given moment against the disengageable 'member of the clutch. WVhile the axles e are moved along, axle w is stopped after disengagement of the clutch and fresh workpieces to be sharpened can be inserted.

In order to somewhat turn the work-pieces for allowing the cooling water to run between the grinding surface and the workpiece, a crank-gearing D is arranged on the machine frame (Z. The connecting rod E of the same is connected by forked arms with the rods 1" of the supports for the work pieces, which are movable to and fro. By putting the crank-gearing in action, the work-pieces can be cooled in the above-mentioned way. The machine can, of course, also be used for sharpening other workpieces, such as pocket-knives, scissors and the like, in which case the supports 9 are correspondingly adapted for a reception of the same and the axles e are fixed in a certain position.

What We claim is:

In a machine for grinding table-knives having a concave strengthening on their ends, in combination, spring-pressed grinding stones arranged at a short distance from each other, means to press the same against the work-pieces led along the same, two supports for the reception of the Work-pieces arranged between said grinding-stones, axles to carry said supports, cam disks to axially shift said rods when grinding, a crank disk to turn said rods to and fro, axles to carry the grinding stones, spiral springs to continuously press said axles and thus the grinding stones toward each other, and cam disks to control the axial movement of said axles against the action of said springs in such a Way that first the strengthening of the blade and then the blade itself is sharpened in one working action, substantially as described and shown. In testimony whereof We have hereunto set our hands in the presence of two subscribing Witnesses.

ERNST DINGER. [1,. s.] HEINRICH TIMMER. [L.S.] Witnesses: ALBERT NUFER, HELEN NUFER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents.

Washington, D. 0. I 

